The uni-polar orthogonal codes, with code length 'n' and code weight 'w' having auto-correlation and cross-correlation constraints equal to 1, can be designed with proposed algorithm. This proposed scheme design all the possible groups containing maximum number of orthogonal codes as per Johnson bounds. In this case, each of the designed groups is independent with other groups of uni-polar orth...

This paper presents the effect of dispersion and Multi Access Interference (MAI) of optical fiber on the Bit Error Rate (BER) performance of a Direct Sequence Optical Code Division Multiple Access (DS-OCDMA) network by means of intensity modulation and ORC. By using Mat lab simulations, Signal-toNoise Ratio (SNR) versus Received Optical Power (ROP) of an OCDMA transmission system can be evaluat...

ohammad M. N. Hamarsheh rab American University, Jenin epartment of Telecommunication Engineering TCE aculty of Information Technology .O. Box 1: 240 Jenin Abstract. A successive interference cancellation scheme is applied to optical code-division multiple-access OCDMA systems with spectral amplitude coding SAC . A detailed analysis of this system, with Hadamard codes used as signature sequence...

An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets thatmake up the overloaded system, the cross-correlation between the users of the two sets is reduced. For randomO/O with square-root cosine rolloff chip pulses, the multiuser interferenc...

Optical code division multiple access (OCDMA) represents the development of optical communication. The advantages OCDMA such as, asynchronous multiuser communication transmission, flexibility, ample bandwidth and scalability; have made this technique a better candidate to be proposed for next generation network on chip. In paper, performance on-chip system is analyzed. Analytical techniques est...

The deployment of code division multiple access (CDMA) technique in optical networks was proposed taking into account the huge optical spectrum availability. In the optical CDMA (OCDMA) systems, multiple users simultaneously sharing the same optical asynchronous channel with neither the necessity of time coordination nor scheduling of resources. However, the attainable levels of multiple access...

We present a new, coherent, heterodyne OCDMA scheme that conveys the signal and reference to each user in a multiple access network via one fiber. The receiver is sourceless and colorless. Bit error rate performance is characterized as a function of system parameters under various conditions.

The growing demand for extensive and reliable structural health monitoring resulted in the development of advanced optical sensing systems (OSS) that conjunction with wireless networks (WON) are capable extending reach to places where fibre provision is not feasible. To support this effort, paper proposes a new type variable weight code called multiweight zero cross-correlation (MW-ZCC) its app...

هدف: کارآفرینی یکی از عوامل کلیدی در توسعه اقتصادی و شاخص اساسی جوامع روبه‌رشد است. آنچه که کارآفرین را به آغاز فعالیت ترغیب می‌کند، انگیزه فرایند تبدیل یک فرد عادی است می‌تواند فرصت‌هایی ایجاد کند حداکثر رساندن ثروت کمک کند. هدف این پژوهش شناسایی طبقه‌بندی انگیزه‌های کارآفرینان می­باشد.طراحی/ روش‌شناسی/ رویکرد: با رویکرد مرور نظام­مند استفاده ماتریس شش سلولی دو مؤلفه جهت (کشش یا فشار) منبع (اق...